The compound that is used as an anaesthetic is

Correct answer: CHCl₃ (chloroform).

Explanation: Chloroform was historically used as an inhalation anaesthetic because it depresses the central nervous system. (Its medical use is now largely obsolete due to toxicity and safer alternatives.)

• CCl₄ — a hepatotoxic solvent; not used as an anaesthetic.
• CH₂Cl₂ (methylene chloride) — common solvent/paint stripper; not an anaesthetic.
• CH₃Cl (methyl chloride) — toxic gas; not used for anaesthesia.